在 Java 中直接将原始类型转换为 object 可以吗？

Question

I am directly casting my int primitive type variable to Integer object like below:

int intValue = 0;
Integer value = (Integer) intValue;

Is this fine or will cause some unexpected problems?

Answer 1

Autoboxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes.

int intValue = 0;
Integer value = intValue; // by Autoboxing

you can also convert it using valueOf method of wrapper class

Integer value = Integer.valueOf(intValue)

Check What code does the compiler generate for autoboxing? if you still have doubts.